[FFmpeg-trac] #5432(avfilter:new): Incorrect colors using filter-complex pad

[FFmpeg]

#5432: Incorrect colors using filter-complex pad
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             Reporter:  Sparkyish  |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  avfilter   |                  Version:  unspecified
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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 When combining 2 images/videos into a side-by-side composition using
 filter_complex (pad), the color/brightness of the left image is slightly
 incorrect. It is hard to tell by simply looking at the image, but it is
 obvious in dark scenes and when using a scope.

 How to reproduce:
 {{{
 ffmpeg -loop 1 -i smpte2.png -i smpte2.png -filter_complex
 "[0:v:0]pad=iw*2:ih[bg];[bg][1:v:0]overlay=w" -pix_fmt yuv420p  -map 0:v
 -b:v:0 9000k -s:v:0 3840x1080 -map 0:a:0? -t 5 test.mp4
 }}}
 Using version N-79344-g196cfc2

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Ticket URL: <https://trac.ffmpeg.org/ticket/5432>
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